Cold hardiness & minimum temperature

Is October Daphne (Sedum sieboldii)cold hardy? Hardiness zone & min temp

Also called October Daphne, October Plant, Siebold's Stonecrop.

More about october daphne

About October Daphne

Sedum sieboldii · also called October Daphne, October Plant · houseplant

Sedum sieboldii is a graceful, deciduous stonecrop from Japan with arching stems bearing whorls of three rounded, blue-grey leaves edged in pink. Clusters of bright pink star flowers appear in autumn — hence the common name October Daphne. It grows naturally in rocky cliff crevices, making it an ideal candidate for pots, hanging baskets, and rocky walls.

Cold limit: USDA 6-9 · RHS H5 (-15 to 28°C)

Watch for — Failure to re-emerge in spring: Plants kept too wet or too cold during winter dormancy lose their fleshy root reserves to rot. Keep almost dry and frost-free (above 0°C) indoors through winter; new growth appears in late spring.

What october daphne's hardiness rating actually means

Yes — october daphne is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 6-9 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about −15 to −10 °C. October Daphne is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for october daphne as it gets too cold:

It tolerates winter lows to about −15 to −10 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can october daphne go outside or overwinter — and where?

Plant it out within USDA 6-9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when october daphne can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

October Daphne hardiness — frequently asked questions

Is october daphne cold hardy?

Yes — october daphne is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. October Daphne is hardy across USDA 6-9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature october daphne can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. October Daphne is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is october daphne?

October Daphne is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can october daphne survive winter outside?

Plant it out within USDA 6-9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to october daphne below its minimum temperature?

It tolerates winter lows to about −15 to −10 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.